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Related Experiment Videos

E2F4-RB and E2F4-p107 complexes suppress gene expression by transforming growth factor beta through E2F binding sites

J M Li1, P P Hu, X Shen

  • 1Department of Pharmacology, Duke University Medical Center, Durham, NC 27708, USA.

Proceedings of the National Academy of Sciences of the United States of America
|May 13, 1997
PubMed
Summary

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Transforming growth factor beta (TGF-beta) halts cell growth by forming E2F-RB complexes. These complexes bind E2F sites, repressing specific gene expression and contributing to TGF-beta

Area of Science:

  • Cell Biology
  • Molecular Biology
  • Genetics

Background:

  • Transforming growth factor beta (TGF-beta) is a key regulator of cell growth, typically inducing cell cycle arrest at the G1 phase.
  • This arrest is mediated by the hypophosphorylation of the retinoblastoma susceptibility gene 1 product (RB), which sequesters E2F transcription factors, preventing cell cycle progression.
  • The precise mechanisms by which TGF-beta represses gene expression, particularly concerning the role of E2F-RB complexes, remain to be fully elucidated.

Purpose of the Study:

  • To investigate the role of E2F-RB and E2F-p107 complexes in TGF-beta-induced gene repression.
  • To determine if E2F binding sites are essential for the transcriptional repression of specific genes under TGF-beta treatment.
  • To elucidate the functional mechanism of E2F-RB/p107 complexes in mediating TGF-beta's growth arrest program.

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Main Methods:

  • Treatment of HaCaT cells with TGF-beta.
  • Analysis of E2F4-RB and E2F4-p107 complex formation and DNA binding.
  • Site-directed mutagenesis of E2F binding sites in gene promoters (E2F1, B-myb, HsORC1, p15(INK4B)).
  • Reporter gene assays to measure promoter activity.
  • Chimeric construct experiments using Gal4-RB and Gal4-p107.

Main Results:

  • TGF-beta treatment induced the formation of E2F4-RB and E2F4-p107 complexes capable of binding to E2F sites.
  • Mutating E2F binding sites significantly increased the expression of E2F1, B-myb, and HsORC1 promoters in TGF-beta-treated cells, indicating repression.
  • Introduction of E2F sites into the p15(INK4B) promoter repressed its TGF-beta-induced expression, and tethering RB or p107 to this promoter via Gal4 sites also inhibited induction.
  • These findings demonstrate that E2F binding sites are crucial for TGF-beta-mediated transcriptional repression.

Conclusions:

  • E2F-RB and E2F-p107 complexes play a critical role in repressing the transcription of specific genes in response to TGF-beta.
  • E2F binding sites are essential for mediating this transcriptional repression, acting as docking sites for these repressor complexes.
  • The findings define a specific mechanism for gene repression by E2F-RB/p107 complexes, integral to the TGF-beta-induced cell growth arrest program.